Benchmark: Associative object array VS array.find

Script Preparation code:

o = {};
a = [];

for (var i = 0; i<= 10000; i++){
	a.push({'id' : ''+i, 'name' : 'name_'+i, 'firstname' : 'firstname_'+i});
  	o[''+i] = {'name' : 'name_'+i, 'firstname' : 'firstname_'+i}
}

Tests:

Get index of object
name = o['1234'].name;
Get array.find
name = a.find(t => t.id == '1234');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Get index of object
Get array.find

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 4 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36

Browser/OS: Chrome 85 on Mac OS X 10.15.6

View result in a separate tab

Test name	Executions per second
Get index of object	2134987.2 Ops/sec
Get array.find	152157.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing the performance of two approaches:

1. **Associative object array lookup**: This approach uses an associative object (`o`) to store data, where each key corresponds to a unique identifier (`id`). The benchmark tests how fast it can retrieve data using this associative object.
2. **Array.find**: This approach uses the `find` method on an array (`a`) to search for a specific element based on a condition.

**Options Compared**

The two options being compared are:

* Associative object array lookup (`o['1234'].name`)
* Array.find (`a.find(t => t.id == '1234')`)

These approaches differ in their data structure, indexing strategy, and search algorithm.

**Pros and Cons of Each Approach**

1. **Associative Object Array Lookup**
	* Pros:
		+ Fast lookups due to direct key access.
		+ Can be more memory-efficient than arrays for large datasets.
	* Cons:
		+ Requires manual management of keys and data structure.
		+ May not be suitable for very large datasets or high-performance applications.
2. **Array.find**
	* Pros:
		+ Easy to implement and maintain.
		+ Can handle complex search conditions using callback functions.
	* Cons:
		+ May be slower than associative object array lookup due to the need to iterate over the entire array.
		+ Less memory-efficient due to the creation of a new function object.

**Library and Purpose**

The `find` method is a built-in method in JavaScript arrays, introduced in ECMAScript 2012 (ES6). It allows searching for an element in an array that satisfies a provided condition. The callback function passed to `find` returns true if the element matches the condition, or false otherwise.

**Special JS Feature/ Syntax**

The benchmark uses a **arrow function** (`t => t.id == '1234'`) as part of the Array.find approach. Arrow functions are a shorthand way of defining small, single-expression functions in JavaScript. They provide a concise syntax and can improve code readability.

**Other Alternatives**

If you need to perform lookups or searches on large datasets, other approaches might include:

* **Sparse arrays**: A data structure that uses indices as keys instead of objects.
* **Hash tables**: Data structures optimized for fast key-based lookups.
* **Database queries**: Using a database to store and retrieve data, which can provide more efficient querying and indexing mechanisms.

Keep in mind that the choice of approach depends on the specific requirements and constraints of your project.

Related benchmarks:

Associative object array VS array.find (version: 0)

Comparing performance of: Get index of object vs Get array.find

Created: 4 years ago by: Guest

Jump to the latest result

Get index of object

Get array.find

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):